MY GO-TO DO IS ...

She's sported everything from beachy waves to dip-dyed tips, but the one style Lauren keeps returning to is the universally flattering high-shine topknot. To get the ballerina beauty must, her hairstylist Kristin Ess uses a shot of Klorane dry shampoo on the updo. ("It will add a little texture," Ess says.) Don't forget to check the back of the bun as well, says Ess, to ensure all the hairs are in place and it doesn't look ridiculously oversized.